I can’t say I have any experience with Walther’s PDWs, but their sporting pistols are - while expensive - beautifully machined and crafted devices. Completely impractical for anything else obviously, but then, .22LR wouldn’t exactly be the caliber of choice for self-defense anyway - nor would pistols with very inconvenient shapes, no safety, deliberately added weight for recoil compensation and very, very sensitive triggers, e.g. 1000g or 1360g. I certainly wouldn’t want to walk around with one strapped to me in a holster.

Most people here tend to shoot only unjacketed .22 for sports in any case - much less barrel wear, less cost and it’s not like anything more is needed to penetrate a paper target anyway.

There’s a number of stringent requirements for secure storage that makes most people just lease room for storing privately owned weapons at the range, and would, even if they did bother obtaining a certified gun safe, make it completely impractical to actually use the weapon for self-defense. I believe privately held weapons are supposed to be stored with the firing pin removed and stored separately, if possible. The same goes for transport.

Frankly, even if a person owns a gun, they’re much better off just getting a metal baseball bat if they’re concerned about home invaders.